{"id":2926,"date":"2026-02-24T20:18:48","date_gmt":"2026-02-24T18:18:48","guid":{"rendered":"https:\/\/labovilleurbanne.fr\/blog\/?p=2926"},"modified":"2026-02-24T20:25:17","modified_gmt":"2026-02-24T18:25:17","slug":"analyse-switch-ubiquiti-us-8-150w-et-us-24-250w-2026-feb","status":"publish","type":"post","link":"https:\/\/labovilleurbanne.fr\/blog\/2026\/02\/24\/analyse-switch-ubiquiti-us-8-150w-et-us-24-250w-2026-feb\/","title":{"rendered":"Analyse switch ubiquiti us-8-150w et US-24-250W &#8211; 2026 &#8211; FEB"},"content":{"rendered":"\n<p>J&rsquo;ai r\u00e9cup\u00e9r\u00e9 un switch Ubiquiti US-8-150W. Malheureusement, il ne fonctionne plus. et nouveau switch US-24-250W<\/p>\n\n\n\n<figure class=\"is-layout-flex wp-block-gallery-2 wp-block-gallery has-nested-images columns-default is-cropped\">\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" width=\"2500\" height=\"1667\" data-id=\"2931\"  src=\"https:\/\/labovilleurbanne.fr\/blog\/wp-content\/uploads\/2026\/02\/us-24-250w-1-edited-2.png\" alt=\"\" class=\"wp-image-2931\" srcset=\"https:\/\/labovilleurbanne.fr\/blog\/wp-content\/uploads\/2026\/02\/us-24-250w-1-edited-2.png 2500w, https:\/\/labovilleurbanne.fr\/blog\/wp-content\/uploads\/2026\/02\/us-24-250w-1-edited-2-700x467.png 700w, https:\/\/labovilleurbanne.fr\/blog\/wp-content\/uploads\/2026\/02\/us-24-250w-1-edited-2-1024x683.png 1024w, https:\/\/labovilleurbanne.fr\/blog\/wp-content\/uploads\/2026\/02\/us-24-250w-1-edited-2-768x512.png 768w, https:\/\/labovilleurbanne.fr\/blog\/wp-content\/uploads\/2026\/02\/us-24-250w-1-edited-2-1536x1024.png 1536w, https:\/\/labovilleurbanne.fr\/blog\/wp-content\/uploads\/2026\/02\/us-24-250w-1-edited-2-2048x1366.png 2048w, https:\/\/labovilleurbanne.fr\/blog\/wp-content\/uploads\/2026\/02\/us-24-250w-1-edited-2-1200x800.png 1200w\" sizes=\"(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 62vw, 840px\" \/><\/figure>\n<\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" loading=\"lazy\" width=\"1024\" height=\"1024\" src=\"https:\/\/labovilleurbanne.fr\/blog\/wp-content\/uploads\/2026\/02\/us-8-150w-1-1024x1024.png\" alt=\"\" class=\"wp-image-2929\" srcset=\"https:\/\/labovilleurbanne.fr\/blog\/wp-content\/uploads\/2026\/02\/us-8-150w-1-1024x1024.png 1024w, https:\/\/labovilleurbanne.fr\/blog\/wp-content\/uploads\/2026\/02\/us-8-150w-1-700x700.png 700w, https:\/\/labovilleurbanne.fr\/blog\/wp-content\/uploads\/2026\/02\/us-8-150w-1-400x400.png 400w, https:\/\/labovilleurbanne.fr\/blog\/wp-content\/uploads\/2026\/02\/us-8-150w-1-768x768.png 768w, https:\/\/labovilleurbanne.fr\/blog\/wp-content\/uploads\/2026\/02\/us-8-150w-1-1536x1536.png 1536w, https:\/\/labovilleurbanne.fr\/blog\/wp-content\/uploads\/2026\/02\/us-8-150w-1-2048x2048.png 2048w, https:\/\/labovilleurbanne.fr\/blog\/wp-content\/uploads\/2026\/02\/us-8-150w-1-1200x1200.png 1200w\" sizes=\"(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 62vw, 840px\" \/><\/figure>\n\n\n\n<!--more-->\n\n\n\n<p><\/p>\n\n\n\n<!-- SLUG SUGG\u00c9R\u00c9 : ubiquiti-us-8-150w-uboot-kernel-debug -->\n\n<h1>Ubiquiti US-8-150W&nbsp;: boot U-Boot, extraction du kernel et debug avanc\u00e9<\/h1>\n\n<p>Suite \u00e0 notre <a href=\"https:\/\/labovilleurbanne.fr\/blog\/2023\/06\/26\/analyse-switch-ubiquiti-us-8-150w\/\">analyse initiale du switch Ubiquiti US-8-150W<\/a>, nous avons poursuivi le reverse engineering et obtenu des avanc\u00e9es significatives.<\/p>\n\n<p>Cette mise \u00e0 jour d\u00e9taille&nbsp;:<\/p>\n\n<ul>\n  <li>le mapping complet de la flash<\/li>\n  <li>le boot manuel via U-Boot<\/li>\n  <li>l\u2019extraction et le chargement d\u2019un kernel<\/li>\n  <li>le contr\u00f4le du middleware Ubiquiti<\/li>\n<\/ul>\n\n<p>Ces techniques permettent d\u00e9sormais un contr\u00f4le quasi complet du processus de boot.<\/p>\n\n<hr>\n\n<h2>Mapping m\u00e9moire flash du US-8-150W<\/h2>\n\n<p>Le mapping de la flash SPI est maintenant enti\u00e8rement identifi\u00e9&nbsp;:<\/p>\n\n<pre><code>0x000000000000-0x0000000c0000 : \"u-boot\"\n0x0000000c0000-0x0000000d0000 : \"u-boot-env\"\n0x0000000d0000-0x0000000e0000 : \"shmoo\"\n0x0000000e0000-0x000000fe0000 : \"kernel0\"\n0x000000fe0000-0x000001ef0000 : \"kernel1\"\n0x000001ef0000-0x000001ff0000 : \"cfg\"\n0x000001ff0000-0x000002000000 : \"EEPROM\"<\/code><\/pre>\n\n<div style=\"border-left: 4px solid #2196F3; padding: 10px; background: #f4f8ff;\">\n<strong> Tip&nbsp;:<\/strong> La pr\u00e9sence de <code>kernel0<\/code> et <code>kernel1<\/code> indique un m\u00e9canisme de mise \u00e0 jour avec rollback automatique.\n<\/div>\n\n<hr>\n\n<h2> Forcer le boot sur kernel0 avec U-Boot<\/h2>\n\n<p>Il est possible de bypass le boot par d\u00e9faut et de charger directement <code>kernel0<\/code> :<\/p>\n\n<pre><code>sf probe\nsf read 0x1000000 0xe0000 0xf00000\nbootm 0x1000000<\/code><\/pre>\n\n<ul>\n  <li><code>0xe0000<\/code> : offset de kernel0<\/li>\n  <li><code>0xf00000<\/code> : taille (~15 MB)<\/li>\n<\/ul>\n\n<div style=\"border-left: 4px solid #ff9800; padding: 10px; background: #fff8f1;\">\n<strong> Attention&nbsp;:<\/strong> une mauvaise adresse ou taille peut provoquer un crash ou un boot invalide.\n<\/div>\n\n<hr>\n\n<h2>Extraction du kernel depuis un firmware Ubiquiti<\/h2>\n\n<h3>Identifier le kernel avec binwalk<\/h3>\n\n<pre><code>binwalk US.MULT.US8_7.2.123+16565.251002.1348.bin<\/code><\/pre>\n\n<pre><code>448410        0x6D79A         uImage header<\/code><\/pre>\n\n<h3>Extraction du kernel<\/h3>\n\n<pre><code>dd if=US.MULT.US8_7.2.123+16565.251002.1348.bin \\\nof=ubi-kernel.img \\\nbs=1 skip=448410 count=15583836 status=progress<\/code><\/pre>\n\n<div style=\"border-left: 4px solid #4caf50; padding: 10px; background: #f1fff3;\">\n<strong> Astuce&nbsp;:<\/strong> le header <code>uImage<\/code> permet de booter directement avec <code>bootm<\/code> sans modification.\n<\/div>\n\n<hr>\n\n<h2>\ud83d\udd0c Chargement du kernel via UART (YMODEM)<\/h2>\n\n<p>Sur le PC&nbsp;:<\/p>\n\n<pre><code>picocom -b 115200 --send-cmd \"sb -vv\" \/dev\/ttyUSB0<\/code><\/pre>\n\n<p>Dans U-Boot&nbsp;:<\/p>\n\n<pre><code>loady<\/code><\/pre>\n\n<p>Puis&nbsp;: <strong>Ctrl-A \u2192 S \u2192 s\u00e9lectionner ubi-kernel.img<\/strong><\/p>\n\n<h3>Boot du kernel<\/h3>\n\n<pre><code>bootm 0x1000000<\/code><\/pre>\n\n<p>Le kernel est charg\u00e9 et ex\u00e9cut\u00e9 sans flash.<\/p>\n\n<hr>\n\n<h2>\ud83e\uddea Analyse du boot Linux<\/h2>\n\n<pre><code>Image Type:   ARM Linux Kernel Image (uncompressed)\nLoad Address: 00018000\nEntry Point:  00018000<\/code><\/pre>\n\n<p>Le chargement \u00e0 <code>0x18000<\/code> confirme un format uImage standard ARM.<\/p>\n\n<hr>\n\n<h2>Bloquer le reset automatique du switch<\/h2>\n\n<p>Apr\u00e8s connexion (<code>ubnt \/ ubnt<\/code>), ex\u00e9cuter imm\u00e9diatement&nbsp;:<\/p>\n\n<pre><code>killall -STOP switch\nkillall -STOP app<\/code><\/pre>\n\n<div style=\"border-left: 4px solid #f44336; padding: 10px; background: #fff1f1;\">\n<strong> Important&nbsp;:<\/strong> cette \u00e9tape doit \u00eatre r\u00e9alis\u00e9e rapidement sinon le syst\u00e8me reprend le contr\u00f4le et reconfigure le switch.\n<\/div>\n\n<hr>\n\n<h2>Debug du middleware Ubiquiti<\/h2>\n\n<pre><code>\/sbin\/switchdrvr<\/code><\/pre>\n\n<p>Permet de relancer manuellement le driver et d\u2019observer le comportement du dataplane.<\/p>\n\n<div style=\"border-left: 4px solid #2196F3; padding: 10px; background: #f4f8ff;\">\n<strong>Tip&nbsp;:<\/strong> utile pour analyser les interactions avec l\u2019ASIC sans watchdog actif.\n<\/div>\n\n<hr>\n\n<h2> R\u00e9sultats et possibilit\u00e9s<\/h2>\n\n<ul>\n  <li>Boot de kernel sans \u00e9criture en flash<\/li>\n  <li>Reverse engineering facilit\u00e9<\/li>\n  <li>Contr\u00f4le du cycle de boot<\/li>\n  <li>Debug du syst\u00e8me r\u00e9seau interne<\/li>\n  <li>Base pour firmware custom<\/li>\n<\/ul>\n\n<hr>\n\n<h2> Perspectives<\/h2>\n\n<ul>\n  <li>Modification du root filesystem<\/li>\n  <li>Injection de configuration personnalis\u00e9e<\/li>\n  <li>Reverse du protocole interne Ubiquiti<\/li>\n  <li>Contr\u00f4le avanc\u00e9 de l\u2019ASIC switch<\/li>\n<\/ul>\n\n<hr>\n<h2>\ud83e\uddfe Conclusion<\/h2>\n\n<p>Ces avanc\u00e9es transforment le switch Ubiquiti US-8-150W en une plateforme enti\u00e8rement contr\u00f4lable pour le reverse engineering et l\u2019exp\u00e9rimentation.<\/p>\n\n<p>Le contr\u00f4le du boot via U-Boot, combin\u00e9 \u00e0 l\u2019extraction et au chargement de kernels, ouvre la voie \u00e0 des firmwares personnalis\u00e9s et \u00e0 une compr\u00e9hension fine du fonctionnement interne du switch.<\/p>\n\n<p><strong>Mots-cl\u00e9s&nbsp;:<\/strong> Ubiquiti US-8-150W, U-Boot, reverse engineering, firmware, kernel extraction, binwalk, switch hacking, embedded Linux<\/p>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>J&rsquo;ai r\u00e9cup\u00e9r\u00e9 un switch Ubiquiti US-8-150W. Malheureusement, il ne fonctionne plus. et nouveau switch US-24-250W<\/p>","protected":false},"author":14,"featured_media":2936,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[82,67,1],"tags":[74,98],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Analyse switch ubiquiti us-8-150w et US-24-250W - 2026 - FEB - LABORATOIRE OUVERT VILLEURBANNAIS<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/labovilleurbanne.fr\/blog\/2026\/02\/24\/analyse-switch-ubiquiti-us-8-150w-et-us-24-250w-2026-feb\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Analyse switch ubiquiti us-8-150w et US-24-250W - 2026 - FEB - LABORATOIRE OUVERT VILLEURBANNAIS\" \/>\n<meta property=\"og:description\" content=\"J&rsquo;ai r\u00e9cup\u00e9r\u00e9 un switch Ubiquiti US-8-150W. 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